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Open AccessArticle

Film Thickness and Shape Evaluation in a Cam-Follower Line Contact with Digital Image Processing

1
Dipartimento di Ingegneria Civile e Industriale, University of Pisa, Largo Lazzarino, 56122 Pisa, Italy
2
Direzione Edilizia e Telecomunicazione, University of Pisa, via Fermi 6/8, 56126 Pisa, Italy
3
Parker Hannifin–FCCE, Via Enrico Fermi 5, 20060 Gessate (MI), Italy
*
Author to whom correspondence should be addressed.
Lubricants 2019, 7(4), 29; https://doi.org/10.3390/lubricants7040029
Received: 29 January 2019 / Revised: 15 March 2019 / Accepted: 25 March 2019 / Published: 28 March 2019
(This article belongs to the Special Issue Automotive Tribology)
Film thickness is the most important parameter of a lubricated contact. Its evaluation in a cam-follower contact is not easy due to the continuous variations of speed, load and geometry during the camshaft rotation. In this work, experimental apparatus with a system for film thickness and shape estimation using optical interferometry, is described. The basic principles of the interferometric techniques and the color spaces used to describe the color components of the fringes of the interference images are reported. Programs for calibration and image analysis, previously developed for point contacts, have been improved and specifically modified for line contacts. The essential steps of the calibration procedure are illustrated. Some experimental interference images obtained with both Hertzian and elastohydrodynamic lubricated cam-follower line contacts are analyzed. The results show program is capable of being used in very different conditions. The methodology developed seems to be promising for a quasi-automatic analysis of large numbers of interference images recorded during camshaft rotation. View Full-Text
Keywords: digital image processing; optical interferometry; non-conformal contacts; cam-follower; Hertzian contacts; film thickness; elastohydrodynamic lubrication digital image processing; optical interferometry; non-conformal contacts; cam-follower; Hertzian contacts; film thickness; elastohydrodynamic lubrication
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MDPI and ACS Style

Ciulli, E.; Pugliese, G.; Fazzolari, F. Film Thickness and Shape Evaluation in a Cam-Follower Line Contact with Digital Image Processing. Lubricants 2019, 7, 29.

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